Does this happen to your truck??

[BJAMMIN]

When I get my pede tuned right, I run it through one tank of fuel and it runs great. On the tank of fuel after that its like I never tuned it. It boggs at high speeds, stalls when I hit the gas and I have no idea why.

[N.stampedeJustin]

i had that same problem and my fuel pressure line had cracked at the base

[Frédérik]

Similar thing happend to me. Dirt entering the carburetor can cause inconsistent mixture ajustment, so at one time it runs very lean, bogs at high speed and 10 seconds later it can be too rich. This was with the stock air filter. I cleaned the carburetor (dirt on the needles) and bought a motor saver air filter, and it solve my problem.
Hope this help

Fred

[RCManiac87]

Oh, i had that same problem, didnt think anything about it till while run half throttle with full tank of fuel it stall. i looked at engine saw the carb. and the high speed neddle had broken off. so if i were you i would replace that because when it broke for me i had to buy a whole new carb.